Thanks for the information. Usually there are a few possibilities for a dog his age and unneutered that come to mind as the most likely:

An injury to the penis usually occuring when trying to mate with a female or even when a female isn't around. Even small cuts can bleed quite a bit and be difficult to find. I would suspect this is the most likely cause and the wound is small enough that it's not readily visible. A larger cut might need veterinary attention so have him seen if you noticed the blood again.

A prostate infection. Unneutered dogs have a much higher chance of prostate infection, cancer and enlargements. Typically dogs with this problem will have to urinate more often and act uncomfortable but that may not always be the case in the early stages. If the blood persists then a veterinarian can examine his prostate for enlargement and do a urinalysis. Antibiotics are generally very effective.

I will tell you that...the things you have to go through to be an Expert are quite rigorous.

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